Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu sach » hieu cach, dien sach, hieu cac
thanh thi » thanh tai, nhanh thi, thanh tri
cong cong » cong dong, trong cong, dung cong
cong hung » cong chung, cong huong, cong dung
thi cong » tai cong, thien cong
hung dan » huong dan, dung dan, tung dan
dan phan » doan phan, dan chan, van phan
phan tap » phan lap, han tap, pha tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu sach) OR (chieu sach)) - thanh thi cong cong hung dan phan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sach) OR (chieu sach)) - thanh thi cong cong hung dan phan tap*".